(CNN) - President Barack Obama called on Congress Thursday to fully fund administration requests for additional diplomatic security measures in the wake of the 2012 attack on the U.S. Consulate in Benghazi, Libya.

The requests include increasing the number of Marine guards dispatched to protect facilities around the world, Obama said.

(CNN) - In a letter to Rep. Darrell Issa exclusively obtained by CNN, the co-chairmen behind an independent review of September's deadly attack in Benghazi, Libya, expressed irritation over the House Oversight Committee chairman's portrayal of their work and requested he call a public hearing at which they can testify.

"The public deserves to hear your questions and our answers," wrote former U.S. ambassador, Thomas Pickering and retired chairman of the Joint Chiefs of Staff, Adm. Mike Mullen. Both are co-chairmen of the Accountability Review Board that was convened to investigate the September 11 attack.